package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.entity.User;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.util.StringUtil;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //新建一个集合，用于存放从begin到end范围内的每天数据
        List<LocalDate> list = new ArrayList<>();
        list.add(begin);
        while (!begin.equals(end)) {
            //获取下一天
            begin = begin.plusDays(1);
            list.add(begin);
        }
        List<Double> turnoverList = new ArrayList<>();
        for (LocalDate start : list) {
            //查询date日期对应的营业额数据，营业额是指：状态为已完成的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(start, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(start, LocalTime.MAX);
            Map<String, Object> map = new HashMap<>();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            //查询对应日期下的每天的营业额
            Double turnover = orderMapper.sumByMap(map);
            if (turnover == null) {
                turnover = 0.0;
            }
            turnoverList.add(turnover);
        }

        log.info("营业额数据：{}", turnoverList);
        log.info("日期数据：{}", list);
        //将日期数据拼接成字符串
        String dateStr = StringUtils.join(list, ",");
        //将营业额数据拼接成字符串
        String turnoverStr = StringUtils.join(turnoverList, ",");
        //构造TurnoverReportVO对象
        TurnoverReportVO turnoverReportVO = TurnoverReportVO.builder()
                .dateList(dateStr)
                .turnoverList(turnoverStr)
                .build();
        return turnoverReportVO;
    }

    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> list = new ArrayList<>();
        list.add(begin);
        while (!begin.equals(end)) {
            //获取下一天
            begin = begin.plusDays(1);
            list.add(begin);
        }
        //存放总用户数量的集合 select count(id) from user where create_time < ?
        List<Integer> totalUserList = new ArrayList<>();
        //存放新增用户数量的集合 select count(id) from user where create_time < ? and create_time >= ?
        List<Integer> newUserList = new ArrayList<>();
        for (LocalDate date : list) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map<String, Object> map = new HashMap<>();
            map.put("end", endTime);
            //查询总用户数量
            Integer totalUser = userMapper.countByMap(map);
            totalUserList.add(totalUser);
            //查询新增用户数量
            map.put("begin", beginTime);
            Integer newUser = userMapper.countByMap(map);
            newUserList.add(newUser);
        }

        return UserReportVO.builder().newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .dateList(StringUtils.join(list, ",")).build();
    }

    @Override
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> list = new ArrayList<>();
        list.add(begin);
        while (!begin.equals(end)) {
            //获取下一天
            begin = begin.plusDays(1);
            list.add(begin);
        }
        //获取全部订单
        List<Integer> orderCountList = new ArrayList<>();
        //获取有效订单
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : list) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            //查询每天全部订单 select count(id) from orders where order_time < ? and order_time >= ?
            Integer orderCount = getOrderCount(beginTime, endTime, null);
            orderCountList.add(orderCount);
            //查询有效订单数 select count(id) from orders where status = 5 and order_time < ? and order_time >= ?
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);
            validOrderCountList.add(validOrderCount);
        }
        //计算时间区间内的订单总数量
        Integer totalCount = orderCountList.stream().reduce(Integer::sum).get();
        //计算时间区间内的有效订单数量
        Integer validCount = validOrderCountList.stream().reduce(Integer::sum).get();
        //计算订单完成率
        Double orderCompletionRate =0.0;
        if (totalCount != 0){
            orderCompletionRate= validCount.doubleValue()/totalCount;
        }
        return OrderReportVO.builder()
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalCount)
                .validOrderCount(validCount)
                .orderCompletionRate(orderCompletionRate)
                .dateList(StringUtils.join(list, ",")).build();
    }

    /**
     * 根据时间范围查询订单数量
     *
     * @param beginTime
     * @param endTime
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime beginTime, LocalDateTime endTime, Integer status) {
        Map<String, Object> map = new HashMap<>();
        map.put("begin", beginTime);
        map.put("end", endTime);
        map.put("status", status);

        Integer orderCount = orderMapper.countByMap(map);
        return orderCount;
    }

    /**
     * 获取订单top10
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        //获取top10数据
        List<String> nameList = new ArrayList<>();
        List<Integer> numberList = new ArrayList<>();
        List<GoodsSalesDTO> list = orderMapper.getSalesTop10(beginTime, endTime);
        for (GoodsSalesDTO goodsSalesDTO : list) {
            nameList.add(goodsSalesDTO.getName());
            numberList.add(goodsSalesDTO.getNumber());
        }
        if (!list.isEmpty()) {
            return SalesTop10ReportVO.builder()
                    .nameList(StringUtils.join(nameList, ","))
                    .numberList(StringUtils.join(numberList, ","))
                    .build();
        }
        return null;
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    public void exportBusinessData(HttpServletResponse response) {
        //1. 查询数据库，获取营业数据---查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2. 通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表格文件的Sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            //获得第4行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获得第5行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3. 通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}
